1. Add poison to
   "Her husband envenomed her drink in order to kill her";
   - poison
    
2. Cause to be bitter or resentful
   "These injustices envenomed her even more";
   - embitter, acerbate

Derived forms: envenoms, envenoming, envenomed

Type of: alter, cast down, change, deject, demoralise [Brit], demoralize, depress, dismay, dispirit, get down, modify

Encyclopedia: Envenom